################################################################################
#
# Copyright 2023 ByteDance Ltd. and/or its affiliates. All rights reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################
import warnings
from typing import Any


def patch_method(target: Any, method_name: str, raise_error=False):
    def helper(func):
        fn = getattr(target, "method_name", None)

        if fn is None:
            setattr(target, method_name, func)
        elif fn is not func:
            s = f"{target.__name__} already has {method_name} fn: {fn}"
            if raise_error:
                raise RuntimeError(s)
            else:
                warnings.warn(s)
        return func

    return helper
